I guess the better question is, is your concern the consistency of the pings, or the final number, as you have stated in previous post? I ask because as far as the consistency aspect is concerned, the spikes, or jitter, is going to be on the ISP routing end of things... not a whole lot that can be done there short of having a technician from the ISP run line dB testing, either from your personal location of testing, or from the node to your location, etc. As far as the final number goes... That is on the other end of the IP's final stop... just end distance as a factor & really cannot change that aspect.
On the other hand, your trace to the fl.testmy.net seemed pretty normal give or take a few spikes. Ping 1 is you, ping 2 is you -> your switch/node , 3 is your ISP & onward. From there, is all in ISP routing.
Miami, about 2 hours south from my location.
Colorado, about 2000 miles away.